Feature Description

Currently, llms/openai/utils.py supports gpt-5.4 and related 5.4 models (#21065 and #20976). However, OpenAI has a dated gpt-5.4-2026-03-05 snapshot that is not currently supported by LlamaIndex's supported model list.

Could gpt-5.4-2026-03-05 please be added to the OpenAI LLM package model registry so that users do not have to rely on the alias gpt-5.4?

Reason

Using the alias gpt-5.4 as a substitute does work functionally for now, but does not allow pinning to the dated snapshot that OpenAI has made available to users already (gpt-5.4-2026-03-05)

Value of Feature

Reproducibility, pinning behavior to the dated snapshot, and avoiding unexpected changes when GPT-5.4 undergoes future updates